Improvement in wacthmen s time-detectors



UNITED STATES PATENT OFFICE.

JACOB QIC. LEVER-K, OF BOSTON, MASSACHUSETTS.

Specification forming part ot" Letlers Patent No. 48,048. dated June fi, 1865.

o @ZZ whom, it may concern Be it known that I, .I ioon BUERK, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and Improved XVatchmans Time-Detector; and I do hereby declare that the following is a full, clear,

and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanyin g drawings, forming a partof this specification, in which* Figure 1 represents a face View of this invention. Fig. 2 is a vertical central section of the same, the line a: c, Fig. 1, indicating the plane of sect-ion. Fig. 3 is an inverted plan of the movement. Fig. -1 is a face view of the same. Fig. 5 is a diagram representing the keys necessary for the operation of this invention.

Similar letters of reference indicate like' parts.

This invention relates to an improvement in that class of watchmens time-detectors on which a patent has been granted to John Buerk, January 1, 1861. In that ease astrip of paper is used stretch ed on the circumference of a drum have been actuated can be ascertained afterthe strip has beentaken off. This construction necessitates a drum in addition t'o the ordinary clock or watch movement, whereby the expense of the mechanism is increased, and, furthermore, the operation ofapplying and removing the strips of paper is tiresome and requires much care. These difculties are avoided by using a clock or watch with a'stationary index and revolving dial. On this revolving vdial are fastened removable dials of paper or other suitable material, with a series of circles corresponding to the positions of the springpoints, and these spring-points are concealed under the stationary index. By inserting one ofthe keys and turning the same round, the paper dial is pierced by one or more of the springpoints, and the time when this tak'es place can be ascertained by examining said dial when the watch or clock is opened. The perforations in the paper dial are made from below, under the stationary hand7 leaving a slight barb on the upper surface, and a similar perforation cannot be produced, even if the watch or clock be opened, except the paper dial is taken off.

A represents a clock or watch movement made in the ordinary manner, and provided with arevolving dial, I3, which is mounted on thecenter shaft, C, in place of the ordinary hands, and which rotates under the stationary index D. The dial is marked with figures from 1 to 12, and it revolves once in twelve hours. From this dial project two or more points, a, which serve to retain a false. dial, E, of paper or suitable material, and this dial is held iu place by a disk, b, which slips over the center shaft, and which is provided with little holes or sockets, to correspond in number and position to the points a. t The paper dial E is marked with figures from 1 to 12, like the main dial, and with a series of concentric rings, c, corresponding in number to the stations 1n the beat. The paper dial shown in the drawings is marked with six rings, to correspond to six different stations. The spaces betweenthe rings c correspond in number and position to a series of spring-points, d, the points of which are situated under the index I) and made to project through a slot in the dial-plate B. Then left to follow their own elasticity, said spring-points do not reach above the surface of the dial-plate; but they are so arranged that one or more of them can be forced up simultaneously and made to penetrate the paper dial, ditferent keys K being provided, each of which serves to .raise one of said springpoints or a combination cf two or more of them. One of these keys is intended to be fastened by a chain or other suitable means to a post or other fixed part on each station in the beat ofthe watchman, and the watchman carries the watch. On arriving at astation he inserts the key, and by turning the same a perforation is produced which gives a record of the time when the watchman has visited th e station. The watch of course is intended to be locked, so that the watchman cannot get at the paper dial in order to produce fraudulent perforations to cover a neglect of his duty, and the keys,`simple as they look, are so shaped 2. Producing the perforations on the papel' dial or its equivalent from the inside ont instead of from the outside in, as before.

J. E. BUERK.

Witnesses:

J. H. Low, A. MEISEL. 

